docs: def get_mean_and_stddevs(self, sites, rup, dists, imt, stddev_types):
          """
          See :meth:`superclass method
          <.base.GroundShakingIntensityModel.get_mean_and_stddevs>`
          for spec of input and result values.
          """
          C = self.COEFFS[imt]
  
          imean = (self._get_magnitude_term(C, rup.mag) +
                   self._get_distance_term(C, dists.rhypo, rup.mag))
          # Convert mean from cm/s and cm/s/s
          if imt.name in "SA PGA":
              mean = np.log((10.0 ** (imean - 2.0)) / g)
          else:
              mean = np.log(10.0 ** imean)
          stddevs = self._get_stddevs(C, len(dists.rhypo), stddev_types)
          return mean, stddevs